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Files named init.py are used to mark directories on disk as a Python package directories. If you have the files
and mydir is on your path, you can import the code in module.py as:
from spam import module
If you remove the init.py file, Python will no longer look for submodules inside that directory, so attempts to import the module will fail.
The init.py file is usually empty, but can be used to export selected portions of the package under more convenient names, hold convenience functions, etc.
Reference: What is __init__.py used for?